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bafc307190
This is equivalent to adding the same field name "" for multiple prefixes in the Xapian query parser, but we have to explicitely construct the resulting query.
282 lines
9 KiB
C++
282 lines
9 KiB
C++
#include "database-private.h"
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#if HAVE_SFSEXP
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#include "sexp.h"
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#include "unicode-util.h"
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/* _sexp is used for file scope symbols to avoid clashing with
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* definitions from sexp.h */
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typedef enum {
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SEXP_FLAG_NONE = 0,
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SEXP_FLAG_FIELD = 1 << 0,
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SEXP_FLAG_BOOLEAN = 1 << 1,
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SEXP_FLAG_SINGLE = 1 << 2,
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SEXP_FLAG_WILDCARD = 1 << 3,
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} _sexp_flag_t;
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/*
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* define bitwise operators to hide casts */
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inline _sexp_flag_t
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operator| (_sexp_flag_t a, _sexp_flag_t b)
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{
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return static_cast<_sexp_flag_t>(
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static_cast<unsigned>(a) | static_cast<unsigned>(b));
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}
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inline _sexp_flag_t
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operator& (_sexp_flag_t a, _sexp_flag_t b)
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{
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return static_cast<_sexp_flag_t>(
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static_cast<unsigned>(a) & static_cast<unsigned>(b));
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}
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typedef struct {
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const char *name;
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Xapian::Query::op xapian_op;
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Xapian::Query initial;
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_sexp_flag_t flags;
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} _sexp_prefix_t;
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static _sexp_prefix_t prefixes[] =
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{
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{ "and", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_NONE },
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{ "attachment", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_WILDCARD },
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{ "body", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD },
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{ "from", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_WILDCARD },
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{ "folder", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "id", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "is", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "mid", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "mimetype", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_WILDCARD },
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{ "not", Xapian::Query::OP_AND_NOT, Xapian::Query::MatchAll,
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SEXP_FLAG_NONE },
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{ "or", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_NONE },
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{ "path", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "property", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "starts-with", Xapian::Query::OP_WILDCARD, Xapian::Query::MatchAll,
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SEXP_FLAG_SINGLE },
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{ "subject", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_WILDCARD },
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{ "tag", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "thread", Xapian::Query::OP_OR, Xapian::Query::MatchNothing,
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SEXP_FLAG_FIELD | SEXP_FLAG_BOOLEAN | SEXP_FLAG_WILDCARD },
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{ "to", Xapian::Query::OP_AND, Xapian::Query::MatchAll,
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SEXP_FLAG_FIELD | SEXP_FLAG_WILDCARD },
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{ }
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};
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static notmuch_status_t _sexp_to_xapian_query (notmuch_database_t *notmuch,
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const _sexp_prefix_t *parent,
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const sexp_t *sx,
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Xapian::Query &output);
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static notmuch_status_t
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_sexp_combine_query (notmuch_database_t *notmuch,
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const _sexp_prefix_t *parent,
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Xapian::Query::op operation,
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Xapian::Query left,
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const sexp_t *sx,
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Xapian::Query &output)
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{
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Xapian::Query subquery;
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notmuch_status_t status;
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/* if we run out elements, return accumulator */
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if (! sx) {
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output = left;
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return NOTMUCH_STATUS_SUCCESS;
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}
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status = _sexp_to_xapian_query (notmuch, parent, sx, subquery);
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if (status)
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return status;
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return _sexp_combine_query (notmuch,
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parent,
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operation,
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Xapian::Query (operation, left, subquery),
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sx->next, output);
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}
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static notmuch_status_t
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_sexp_parse_phrase (std::string term_prefix, const char *phrase, Xapian::Query &output)
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{
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Xapian::Utf8Iterator p (phrase);
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Xapian::Utf8Iterator end;
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std::vector<std::string> terms;
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while (p != end) {
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Xapian::Utf8Iterator start;
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while (p != end && ! Xapian::Unicode::is_wordchar (*p))
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p++;
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if (p == end)
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break;
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start = p;
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while (p != end && Xapian::Unicode::is_wordchar (*p))
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p++;
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if (p != start) {
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std::string word (start, p);
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word = Xapian::Unicode::tolower (word);
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terms.push_back (term_prefix + word);
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}
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}
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output = Xapian::Query (Xapian::Query::OP_PHRASE, terms.begin (), terms.end ());
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return NOTMUCH_STATUS_SUCCESS;
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}
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static notmuch_status_t
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_sexp_parse_wildcard (notmuch_database_t *notmuch,
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const _sexp_prefix_t *parent,
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std::string match,
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Xapian::Query &output)
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{
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std::string term_prefix = parent ? _find_prefix (parent->name) : "";
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if (parent && ! (parent->flags & SEXP_FLAG_WILDCARD)) {
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_notmuch_database_log (notmuch, "'%s' does not support wildcard queries\n", parent->name);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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output = Xapian::Query (Xapian::Query::OP_WILDCARD,
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term_prefix + Xapian::Unicode::tolower (match));
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return NOTMUCH_STATUS_SUCCESS;
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}
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static notmuch_status_t
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_sexp_parse_one_term (notmuch_database_t *notmuch, std::string term_prefix, const sexp_t *sx,
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Xapian::Query &output)
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{
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Xapian::Stem stem = *(notmuch->stemmer);
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if (sx->aty == SEXP_BASIC && unicode_word_utf8 (sx->val)) {
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std::string term = Xapian::Unicode::tolower (sx->val);
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output = Xapian::Query ("Z" + term_prefix + stem (term));
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return NOTMUCH_STATUS_SUCCESS;
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} else {
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return _sexp_parse_phrase (term_prefix, sx->val, output);
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}
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}
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/* Here we expect the s-expression to be a proper list, with first
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* element defining and operation, or as a special case the empty
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* list */
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static notmuch_status_t
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_sexp_to_xapian_query (notmuch_database_t *notmuch, const _sexp_prefix_t *parent, const sexp_t *sx,
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Xapian::Query &output)
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{
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if (sx->ty == SEXP_VALUE) {
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std::string term = Xapian::Unicode::tolower (sx->val);
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Xapian::Stem stem = *(notmuch->stemmer);
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std::string term_prefix = parent ? _find_prefix (parent->name) : "";
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if (sx->aty == SEXP_BASIC && strcmp (sx->val, "*") == 0) {
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return _sexp_parse_wildcard (notmuch, parent, "", output);
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}
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if (parent && (parent->flags & SEXP_FLAG_BOOLEAN)) {
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output = Xapian::Query (term_prefix + sx->val);
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return NOTMUCH_STATUS_SUCCESS;
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}
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if (parent) {
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return _sexp_parse_one_term (notmuch, term_prefix, sx, output);
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} else {
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Xapian::Query accumulator;
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for (_sexp_prefix_t *prefix = prefixes; prefix->name; prefix++) {
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if (prefix->flags & SEXP_FLAG_FIELD) {
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notmuch_status_t status;
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Xapian::Query subquery;
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term_prefix = _find_prefix (prefix->name);
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status = _sexp_parse_one_term (notmuch, term_prefix, sx, subquery);
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if (status)
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return status;
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accumulator = Xapian::Query (Xapian::Query::OP_OR, accumulator, subquery);
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}
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}
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output = accumulator;
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return NOTMUCH_STATUS_SUCCESS;
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}
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}
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/* Empty list */
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if (! sx->list) {
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output = Xapian::Query::MatchAll;
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return NOTMUCH_STATUS_SUCCESS;
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}
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if (sx->list->ty == SEXP_LIST) {
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_notmuch_database_log (notmuch, "unexpected list in field/operation position\n",
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sx->list->val);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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for (_sexp_prefix_t *prefix = prefixes; prefix && prefix->name; prefix++) {
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if (strcmp (prefix->name, sx->list->val) == 0) {
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if (prefix->flags & SEXP_FLAG_FIELD) {
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if (parent) {
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_notmuch_database_log (notmuch, "nested field: '%s' inside '%s'\n",
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prefix->name, parent->name);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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parent = prefix;
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}
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if ((prefix->flags & SEXP_FLAG_SINGLE) &&
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(! sx->list->next || sx->list->next->next || sx->list->next->ty != SEXP_VALUE)) {
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_notmuch_database_log (notmuch, "'%s' expects single atom as argument\n",
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prefix->name);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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if (prefix->xapian_op == Xapian::Query::OP_WILDCARD)
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return _sexp_parse_wildcard (notmuch, parent, sx->list->next->val, output);
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return _sexp_combine_query (notmuch, parent, prefix->xapian_op, prefix->initial,
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sx->list->next, output);
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}
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}
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_notmuch_database_log (notmuch, "unknown prefix '%s'\n", sx->list->val);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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notmuch_status_t
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_notmuch_sexp_string_to_xapian_query (notmuch_database_t *notmuch, const char *querystr,
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Xapian::Query &output)
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{
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const sexp_t *sx = NULL;
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char *buf = talloc_strdup (notmuch, querystr);
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sx = parse_sexp (buf, strlen (querystr));
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if (! sx) {
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_notmuch_database_log (notmuch, "invalid s-expression: '%s'\n", querystr);
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return NOTMUCH_STATUS_BAD_QUERY_SYNTAX;
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}
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return _sexp_to_xapian_query (notmuch, NULL, sx, output);
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}
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#endif
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